HEEELLPPPPPPPPPP!!!!!!!!!!!
Use the context clues in this passage to determine the meaning of the word preposterous.

Sally was so excited to show her sister, Liza, the leprechaun trap she made. All she had to do was wait for a rainbow to appear. After listening to Sally ramble on about catching a leprechaun and finding his pot of gold, Liza burst out laughing and said, "Sally, that idea is preposterous."

What does preposterous mean?
ridiculous
brilliant
difficult